On Tue, Feb 18, 2020 at 03:33:46PM +0100, Christian Brauner wrote: > With fsid mappings we can solve this by writing an id mapping of 0 > 100000 100000 and an fsid mapping of 0 300000 100000. On filesystem > access the kernel will now lookup the mapping for 300000 in the fsid > mapping tables of the user namespace. And since such a mapping exists, > the corresponding files will have correct ownership. So if I have /proc/self/uid_map: 0 100000 100000 /proc/self/fsid_map: 1000 1000 1 1. If I read files from the rootfs which have host uid 101000, they will appear as uid 100 to me? 2. If I read host files with uid 1000, they will appear as uid 1000 to me? 3. If I create a new file, as uid 1000, what will be the inode owning uid?
